Randomization of images

[Gautam Malu]

Hi all,
          i am developing a simple face recognition task.  i am using
picture stimuli. I have images of 20 models , 3 images per model so total
3*20 = 60 images.
1_right_pose.jpg
1_left_pose.jpg
1_middle_pose.jpg
 ............................ total 60 images
Experiment consists of 2 phases

 -->1st in learning phase, in which participants will see 2 poses of any 10
models.
i.e total 2*10 = 20 images randomly each images for 3000ms
n_right_pose.jpg
m_left_pose.jpg

.......total 20 images

---> 2nd is testing phase, In which participants will see all 20 model in
middle pose, randomly  for 500ms, followed by fixation of infinite duration
and during which they have to respond whether or not  they have seen that
model in learning phase.
n_middle_pose.jpg
fixation.jpg
...........20 times


now the problem i am facing is how to select 10 random model's both
right_pose.jpg and left_pose.jpg and also display them in random order.
how can i get this type of ordering in learning phase
Example
3_right_pose.jpg
7_left_pose.jpg
11_left_pose.jpg
3_left_pose.jpg



Thanks,


----
Gautam Malu

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